Electronic toothbrush



FIG. 1 is a perspective view of our new design for an electronic toothbrush;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a side elevation view thereof;

FIG. 5 is the other side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is another perspective view thereof.

The broken lines depict portions of the electronic toothbrush that form no part of the claimed design. 

CLAIM The ornamental design for an electronic toothbrush, as shown and described. 